Biological and life-history parameters for Labeo rosae Steindachner, 1894 and Oreochromis mossambicus (Peters, 1852) from Flag Boshielo Dam, Olifants River, South Africa

IF 1.1 4区 环境科学与生态学 Q3 MARINE & FRESHWATER BIOLOGY
HA Hlungwani, SM Marr, O. Weyl, JR Sara
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Abstract

Inland fisheries contribute towards food security for rural communities living close to large aquatic systems. However, sustainable inland fisheries rely on accurate biological information for the target species at the proposed fishery location. In this study, the biological information for Labeo rosae Steindachner, 1894 and Oreochromis mossambicus (Peters, 1852) were determined at Flag Boshielo Dam, Olifants River system, Limpopo province, as part of a larger study to evaluate a small-scale gill net fishery at this impoundment. Nine fish surveys were conducted from February 2016 to April 2017 using mixed sampling gears. Labeo rosae exhibited positive allometric growth (b > 3) while O. mossambicus displayed negative growth (b < 3). For L. rosae, the asymptotic length was 391 mm L ∞, and the length-at-50% sexual maturity 165.8 mm. For O. mossambicus, the asymptotic length was 420 mm L ∞, and the length-at-50% sexual maturity 166.5 mm. Both species population stocks showed signs of exploitation. Total mortality for L. rosae was 0.57 yr−1 with a fishing exploitation of 0.21 yr−1, while total mortality of 0.78 yr−1 and fishing exploitation of 0.50 yr–1 were estimated for O. mossambicus. The biological data collected, apart from the length–weight parameters for O. mossambicus, are suitable for conducting a fisheries assessment for these species at Flag Boshielo Dam.
南非Olifants河Flag Boshielo大坝的Labeo rosae Steindachner,1894和Oreochromis mossambicus(Peters,1852)的生物和生活史参数
内陆渔业有助于生活在大型水生系统附近的农村社区的粮食安全。然而,可持续的内陆渔业依赖于拟议渔业地点目标物种的准确生物信息。在这项研究中,在林波波省Olifants河系统的Flag Boshielo大坝确定了Labeo rosae Steindachner,1894和Oreochromis mossambicus(Peters,1852)的生物信息,作为评估该蓄水处小规模刺网渔业的更大研究的一部分。2016年2月至2017年4月,使用混合采样装置进行了9次鱼类调查。Labeo rosae表现出阳性异速生长(b>3),而O.mossambicus表现出阴性生长(b<3)。玫瑰的渐近长度为391毫米L∞,50%性成熟期的长度为165.8毫米。苔藓虫的渐近长度是420毫米L∞。50%性成熟度的长度为166.5毫米。两个物种种群都显示出开发的迹象。玫瑰乳杆菌的总死亡率为0.57年-1,捕捞利用率为0.21年-1,而莫桑比克菌的总死亡率估计为0.78年-1,捕鱼利用率为0.50年-1。所收集的生物数据,除了O.mossambicus的长度-重量参数外,适用于在Flag Boshielo大坝对这些物种进行渔业评估。
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来源期刊
African Journal of Aquatic Science
African Journal of Aquatic Science MARINE & FRESHWATER BIOLOGY-
CiteScore
3.90
自引率
7.10%
发文量
31
审稿时长
>12 weeks
期刊介绍: The African Journal of Aquatic Science is an international journal devoted to the study of the aquatic sciences, covering all African inland and estuarine waters. The Journal publishes peer-reviewed original scientific papers and short articles in all the aquatic science fields including limnology, hydrobiology, ecology, conservation, biomonitoring, management, water quality, ecotoxicology, biological interactions, physical properties and human impacts on African aquatic systems.
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